CA1301075C - Vented loudspeaker - Google Patents
Vented loudspeakerInfo
- Publication number
- CA1301075C CA1301075C CA000585208A CA585208A CA1301075C CA 1301075 C CA1301075 C CA 1301075C CA 000585208 A CA000585208 A CA 000585208A CA 585208 A CA585208 A CA 585208A CA 1301075 C CA1301075 C CA 1301075C
- Authority
- CA
- Canada
- Prior art keywords
- vent tube
- loudspeaker according
- wall
- angle
- section
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000003292 glue Substances 0.000 description 2
- 239000012943 hotmelt Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 230000003416 augmentation Effects 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2807—Enclosures comprising vibrating or resonating arrangements
- H04R1/2815—Enclosures comprising vibrating or resonating arrangements of the bass reflex type
- H04R1/2819—Enclosures comprising vibrating or resonating arrangements of the bass reflex type for loudspeaker transducers
Landscapes
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
Abstract
ABSTRACT
A vented loudspeaker has a speaker and a vent tube within the loudspeaker enclosure, the vent tube being arranged obliquely to the wall on which it is mounted and being longer than the distance between that wall and the opposite wall.
A vented loudspeaker has a speaker and a vent tube within the loudspeaker enclosure, the vent tube being arranged obliquely to the wall on which it is mounted and being longer than the distance between that wall and the opposite wall.
Description
~3 1)1~
The present invention relates to loudspeakers, and more particularly to vented loudspeakers.
Vented loudspeakers are loudspeakers that are provided with vent tubes to improve the response of the loudspea~er, particularly at low frequencies. The vent tubes, generally PVC
tubes of circular cross-section, are mounted on one wall Or the loudspeaker enclosure, the wall having an aperture therein for outward pro~ection of sound from the vent tube and through the aperture. The length o~ the vent tube is a function of the radius of the vent tube such that a larger vent radius requires a longer vent tube. Generally speaking, it is desired to use a vent tube having as large a radius as possible.
Until now, vent tubes have been mounted perpendicular to the apertured wall of the speaker, which has placed a limit on the maxim~ vent tube length and hence on the maximum vent tube radius. Speaker Builder, No. 2 (1981), Edward T. Dell, Jr., Peterborough, N.H., page 20, states "For a given system, the maximum allowable vent length must obviously be somewhat shorter than the box dimension parallel to the tube; so the vent radius is indirectly limited by the box dimensions".
The present invention overcomes this limitation on the vent tube length and radius by mounting a straight vent tube with its axis at an oblique angle with respect to the apertured wall, (i.e. neither parallel nor perpendicular to the wall), the length of the vent tube being greater than the distance between the \
apertured wall and the opposite wall. Preferably, the angle is substantially about 40.
In particular, the present invention provides a vented loudspeaker which comprises an enclosure having top, bottom, front, rear and opposed side walls, one o~ the walls having an aperture therein and one of the walls having an opening therein, a speaker within the enclosure and mounted on the wall having the opening for outward pro~ection of sound through the opening, and an elongated, straight vent tube within the enclosure and molmted on the apertured wall for outward pro,~ection of souncl through the aperture, the vent tube beinK arranged with i.ts axis at an oblique angle with respect to the apertured wall and extending to, but spaced from, the wall opposite the apertured wall, the length of the vent tube being greater than the distance between the apertured wall and the opposite wall.
The use of the inclined, straight vent tube provides a vent tube aperture of larger area than the cross-section of the vent tube, which is desirable. However, the area of the vent tube aperture must not be too large, the desired area being empirically determined.
The apertured wall to which the vent tube is mounted may be any wall, such as the front, rear or side wall. Usually, the apertured wall will be selected to provide the longest length for the vent tube. The axis o~ the vent tube may be disposed in a horizontal plane or a vertical plane, or the vent tube axis may ~2--be disposed obl~quely to both the horlzontal and vertical.
Preferably, the vent tube is flush mounted on, or mounted in a counterbore in, the inner surface of the apertured wall to which it is attached. It is presently preferred that the apertured wall be the front or rear wall.
The present invention is illustrated in terms of its preferred embodiments in the accompanying drawings, in which:
Fig. 1 is a perspective view of the ventecl loudspeaker of my invention, with the top and side walls removed for clarity;
Fig. 2 is a top view of the loudspeaker of Fig. l viewed in the direction of lines 2-2 in Fig. 1;
Fig. 2A is a detail view of the rear wall of the loudspeaker as viewed in the direction of lines 2A-2A in Fig. 2;
Fig. 3 is a side elevational view of the loudspeaker of Fig-. 1 viewed in the direction of lines 3-3 in Fig. l;
Figs. 4 and 5 are views similar to Figs. 2 and 3, respectively, of another embodiment of the invention;
Fig. 5A is a detail view similar to Fig. 2A as viewed in the direction of lines 5A-5A in Fig. 5;
Fig. 6 is a detail view, in section, of another embodiment of the invention;
Fig. 6A is a view similar to Fig. 6 of another embodiment of the invention; and Fig. 7 is a view similar to Figs. 2 and 5 of another embodiment of the invention.
Referring to the drawings, Fig. l shows a loudspeaker having a housing or enclosure 1 comprising front wall 2, rear wall 3, bottom wall 4 and side wall 5. The opposed side wall and top wall have been omitted for clarity. As is known, the six walls form an enclosure 1 that has no air passages other than vent aperture 10 formed in the rear wall 3.
Mounted in the interior of the enclosure l is a speaker 6, which pro~ects sound outwardly through an opening 7 ~ormed in the front wall 2. When enclosure 1 has only one speaker 6, the speaker 6 will be a woo~er or other speaker designed to reproduce sound of low to moderately low frequencies. When it is desired to provide a full range speaker system, other driving elements, such as mid-range speakers and/or tweeters, will be included.
For simplicity, enclosure l is shown with only one speaker 6, such as provided with a subwoofer for bass augmentation only, which would be used with satellite speaker systems co~ering the remainder of the audible spectrum. When mid range and/or tweeter elements (not shown) are used, they may be mounted in enclosure 1 in accordance with known techniques.
Vent tube ll, which pro~ects sound outwardly through aperture lO~ is arranged obliquely to the horizontal and vertical, with the vent tube axis A (Figs. 2 and 3) making an angle of substantially about 40 with respect to the rear wall 3 Since the length of vent tube 11 is longer than the distanc~
between walls 2 and 3, the radius of vent tube 11 may be larger than if the vent tube 11 were perpendicular to walls 2,3, and hence an improved bass response is provided as compared to prior art systems.
Vent tube 11 extends toward but is spaced from the front wall 2. It is presently preferred to position the free end of vent tube 10 about one inch from the front wall 2, but the actual spacing chosen for a given speaker enclosure will be empirically determined. In general, a larger distance betwee~
the free end and the adjacent wall provides for more efficient performance of the vent tube, particularly for larger speaker systems featuring lower frequency reproduction. On the other hand, too great a spacing may unduly shorten the desired length of the vent tube 11. The free end of the vent tube will preferably be at the same angle with respect to the vent tube axis as the angle between the vent tube axis and the apertured wall to which the vent tube is attached, since this generally provides the best acoustical results.
Figs. 4 and 5 show enclosure 1 provided with a vent aperture 20 in front wall 2 and a vent tube 21 extending from the front wall 2 toward but spaced from rear wall 3~ In Figs. 4 and 5, the vent tube 21 lies in a horizontal plane when the axis B of speaker 6 is in its normally hori~ontal position.
In Figs. 1-5, the vent tube 11 or 21 is flush mounted to the inner surface of rear wall 3 or front wall 2, respectively.
Figs. 6 and 6A show vent tubes 11' and 21', respectively, mounted in the front wall 2 and arranged with the vent tube axis A lying in a vertical plane.
As shown in Fig. 6, the vent tube 11' may extend through the aperture 20', with the lip or flange lla adhesively secured to wall 2. As is known, a flush mounted vent tube need only be sealed at the inner sur~ace of the apertured wall to which it is attached. In the arrangement shown in Fig. ~, the vent tube lli is sealed by securing the lip lla to the outer sur~ace of the wall 2. In Figs. 1-5, a seal 30 is formed by the use of hot melt glue as conventionally used.
~ig. 6A shows the vent tube 21' adhesively mounted in a counterbore 2a in the bore 20' so that the vent tube 21' is partially recessed in wall 2. A recess of from about 1/8 to 3/8 inch has been found to be satisfactory. ~he use of colmte~bore 2a makes it more convenient to mount a vent tube in a wall.
Fig. 7 shows a vent tube 31 arranged at an angle Or from about 35 to about 45, preferably substantially about 4Q, with respect to side wall 5 and extending to but spaced from the opposed side wall 5a. Side wall 5 is provided with vent aperture 32.
It is presently preferred to adhesively secure the vent tube to the wall by means of hot melt glue to provide stability and reduce self resonance. However, it may be suitable simply to press fit the vent tube into the aperture in the wall, although this is not presently pre~erred.
As is known the vent tube may be of any desired cross-section and material. For convenience, plastic pipe, such as PVC or ABS pipe9 o~ circular cross-section may be used.
To produce the loudspeaker of the present invention, the desired dimensions and materials for speaker 6 are selected and an enclosure 1 is bu:ilt for that speaker using con~entional technlques, such as detailed ln Loudspeaker Design Cookbook, Vance Dickason, Marshall Jones Co., Francestown, N.H., 19~7, and Speaker Builder. The length of the vent tube is then selected to provide the greatest diameter of the vent tube, taking into account the longest length possible ~or the geometry of the enclosure and also taking into account internal obstructions~
such as speaker parts. Pre~erably, the vent tube will be disposed with lts axls at an angle of from about 35 to abou~ 45 to the front or rear wall. While the angle may be less than 35 or more than 45, such as ~rom about 20 to about 50, the advantages Or the invention, i.e. an improvement in the sound qualities, are optimized at the pre~erred angle of ~rom about 35 to about 45. The axis of the vent tube may be disposed in a horizontal or vertical plane or it may be oblique to the horizontal and vertical.
With the maximum allowable length of the vent tube thus selected, the radius of the vent tube is provided in accordance with known equations. For example, for a vent tube of circular cross-section that is flush-mounted on the apertured wall, the length (Lv) and radius (R) of the vent tube are related as ~ollows:
Lv = 1.463 x 107R2 - 1.463R
~B VB
where Lv ~ len~th in inches fB = tuning frequency in Hz VB = volume o~ the enclosure in cubic inches R = radius in inches Both Loudspeaker Design Cookbook and Speaker Builder describe in detail how to use the above equation to obtain a vent tube.
The location of the vent tube in the loudspeaker of the invention will also be guided by known techniques. Preferably, the vent tube will be mounted on the front or rear wall o~ the enclosure.
In a preferred embodiment of the invention~ the enclosure of the speaker system was ll-l/4 inches high, 6-3/4 inches wide and 7 inches deep in which were mounted a 5-l/4 inch polypropylene cone woofer and a 3/4 inch polycarbonate dome tweeter. A l-l/2 inch diameter straight vent tube was flush mounted in the rear wall at an angle of about 40 to the rear wall to provide an oval aperture of 1-1/2 x 2-3/8 inches. In lab tests conducted by an independent acoustical laboratory retained by Stereo Review Magazine, this mini-speaker system had an octave-to-octave energy balance from 100 to 10,000 Hz that was close to the balance of the lab's full size reference speakers. The enclosure had no other air passage except the oval aperture in the rear wall.
_g_
The present invention relates to loudspeakers, and more particularly to vented loudspeakers.
Vented loudspeakers are loudspeakers that are provided with vent tubes to improve the response of the loudspea~er, particularly at low frequencies. The vent tubes, generally PVC
tubes of circular cross-section, are mounted on one wall Or the loudspeaker enclosure, the wall having an aperture therein for outward pro~ection of sound from the vent tube and through the aperture. The length o~ the vent tube is a function of the radius of the vent tube such that a larger vent radius requires a longer vent tube. Generally speaking, it is desired to use a vent tube having as large a radius as possible.
Until now, vent tubes have been mounted perpendicular to the apertured wall of the speaker, which has placed a limit on the maxim~ vent tube length and hence on the maximum vent tube radius. Speaker Builder, No. 2 (1981), Edward T. Dell, Jr., Peterborough, N.H., page 20, states "For a given system, the maximum allowable vent length must obviously be somewhat shorter than the box dimension parallel to the tube; so the vent radius is indirectly limited by the box dimensions".
The present invention overcomes this limitation on the vent tube length and radius by mounting a straight vent tube with its axis at an oblique angle with respect to the apertured wall, (i.e. neither parallel nor perpendicular to the wall), the length of the vent tube being greater than the distance between the \
apertured wall and the opposite wall. Preferably, the angle is substantially about 40.
In particular, the present invention provides a vented loudspeaker which comprises an enclosure having top, bottom, front, rear and opposed side walls, one o~ the walls having an aperture therein and one of the walls having an opening therein, a speaker within the enclosure and mounted on the wall having the opening for outward pro~ection of sound through the opening, and an elongated, straight vent tube within the enclosure and molmted on the apertured wall for outward pro,~ection of souncl through the aperture, the vent tube beinK arranged with i.ts axis at an oblique angle with respect to the apertured wall and extending to, but spaced from, the wall opposite the apertured wall, the length of the vent tube being greater than the distance between the apertured wall and the opposite wall.
The use of the inclined, straight vent tube provides a vent tube aperture of larger area than the cross-section of the vent tube, which is desirable. However, the area of the vent tube aperture must not be too large, the desired area being empirically determined.
The apertured wall to which the vent tube is mounted may be any wall, such as the front, rear or side wall. Usually, the apertured wall will be selected to provide the longest length for the vent tube. The axis o~ the vent tube may be disposed in a horizontal plane or a vertical plane, or the vent tube axis may ~2--be disposed obl~quely to both the horlzontal and vertical.
Preferably, the vent tube is flush mounted on, or mounted in a counterbore in, the inner surface of the apertured wall to which it is attached. It is presently preferred that the apertured wall be the front or rear wall.
The present invention is illustrated in terms of its preferred embodiments in the accompanying drawings, in which:
Fig. 1 is a perspective view of the ventecl loudspeaker of my invention, with the top and side walls removed for clarity;
Fig. 2 is a top view of the loudspeaker of Fig. l viewed in the direction of lines 2-2 in Fig. 1;
Fig. 2A is a detail view of the rear wall of the loudspeaker as viewed in the direction of lines 2A-2A in Fig. 2;
Fig. 3 is a side elevational view of the loudspeaker of Fig-. 1 viewed in the direction of lines 3-3 in Fig. l;
Figs. 4 and 5 are views similar to Figs. 2 and 3, respectively, of another embodiment of the invention;
Fig. 5A is a detail view similar to Fig. 2A as viewed in the direction of lines 5A-5A in Fig. 5;
Fig. 6 is a detail view, in section, of another embodiment of the invention;
Fig. 6A is a view similar to Fig. 6 of another embodiment of the invention; and Fig. 7 is a view similar to Figs. 2 and 5 of another embodiment of the invention.
Referring to the drawings, Fig. l shows a loudspeaker having a housing or enclosure 1 comprising front wall 2, rear wall 3, bottom wall 4 and side wall 5. The opposed side wall and top wall have been omitted for clarity. As is known, the six walls form an enclosure 1 that has no air passages other than vent aperture 10 formed in the rear wall 3.
Mounted in the interior of the enclosure l is a speaker 6, which pro~ects sound outwardly through an opening 7 ~ormed in the front wall 2. When enclosure 1 has only one speaker 6, the speaker 6 will be a woo~er or other speaker designed to reproduce sound of low to moderately low frequencies. When it is desired to provide a full range speaker system, other driving elements, such as mid-range speakers and/or tweeters, will be included.
For simplicity, enclosure l is shown with only one speaker 6, such as provided with a subwoofer for bass augmentation only, which would be used with satellite speaker systems co~ering the remainder of the audible spectrum. When mid range and/or tweeter elements (not shown) are used, they may be mounted in enclosure 1 in accordance with known techniques.
Vent tube ll, which pro~ects sound outwardly through aperture lO~ is arranged obliquely to the horizontal and vertical, with the vent tube axis A (Figs. 2 and 3) making an angle of substantially about 40 with respect to the rear wall 3 Since the length of vent tube 11 is longer than the distanc~
between walls 2 and 3, the radius of vent tube 11 may be larger than if the vent tube 11 were perpendicular to walls 2,3, and hence an improved bass response is provided as compared to prior art systems.
Vent tube 11 extends toward but is spaced from the front wall 2. It is presently preferred to position the free end of vent tube 10 about one inch from the front wall 2, but the actual spacing chosen for a given speaker enclosure will be empirically determined. In general, a larger distance betwee~
the free end and the adjacent wall provides for more efficient performance of the vent tube, particularly for larger speaker systems featuring lower frequency reproduction. On the other hand, too great a spacing may unduly shorten the desired length of the vent tube 11. The free end of the vent tube will preferably be at the same angle with respect to the vent tube axis as the angle between the vent tube axis and the apertured wall to which the vent tube is attached, since this generally provides the best acoustical results.
Figs. 4 and 5 show enclosure 1 provided with a vent aperture 20 in front wall 2 and a vent tube 21 extending from the front wall 2 toward but spaced from rear wall 3~ In Figs. 4 and 5, the vent tube 21 lies in a horizontal plane when the axis B of speaker 6 is in its normally hori~ontal position.
In Figs. 1-5, the vent tube 11 or 21 is flush mounted to the inner surface of rear wall 3 or front wall 2, respectively.
Figs. 6 and 6A show vent tubes 11' and 21', respectively, mounted in the front wall 2 and arranged with the vent tube axis A lying in a vertical plane.
As shown in Fig. 6, the vent tube 11' may extend through the aperture 20', with the lip or flange lla adhesively secured to wall 2. As is known, a flush mounted vent tube need only be sealed at the inner sur~ace of the apertured wall to which it is attached. In the arrangement shown in Fig. ~, the vent tube lli is sealed by securing the lip lla to the outer sur~ace of the wall 2. In Figs. 1-5, a seal 30 is formed by the use of hot melt glue as conventionally used.
~ig. 6A shows the vent tube 21' adhesively mounted in a counterbore 2a in the bore 20' so that the vent tube 21' is partially recessed in wall 2. A recess of from about 1/8 to 3/8 inch has been found to be satisfactory. ~he use of colmte~bore 2a makes it more convenient to mount a vent tube in a wall.
Fig. 7 shows a vent tube 31 arranged at an angle Or from about 35 to about 45, preferably substantially about 4Q, with respect to side wall 5 and extending to but spaced from the opposed side wall 5a. Side wall 5 is provided with vent aperture 32.
It is presently preferred to adhesively secure the vent tube to the wall by means of hot melt glue to provide stability and reduce self resonance. However, it may be suitable simply to press fit the vent tube into the aperture in the wall, although this is not presently pre~erred.
As is known the vent tube may be of any desired cross-section and material. For convenience, plastic pipe, such as PVC or ABS pipe9 o~ circular cross-section may be used.
To produce the loudspeaker of the present invention, the desired dimensions and materials for speaker 6 are selected and an enclosure 1 is bu:ilt for that speaker using con~entional technlques, such as detailed ln Loudspeaker Design Cookbook, Vance Dickason, Marshall Jones Co., Francestown, N.H., 19~7, and Speaker Builder. The length of the vent tube is then selected to provide the greatest diameter of the vent tube, taking into account the longest length possible ~or the geometry of the enclosure and also taking into account internal obstructions~
such as speaker parts. Pre~erably, the vent tube will be disposed with lts axls at an angle of from about 35 to abou~ 45 to the front or rear wall. While the angle may be less than 35 or more than 45, such as ~rom about 20 to about 50, the advantages Or the invention, i.e. an improvement in the sound qualities, are optimized at the pre~erred angle of ~rom about 35 to about 45. The axis of the vent tube may be disposed in a horizontal or vertical plane or it may be oblique to the horizontal and vertical.
With the maximum allowable length of the vent tube thus selected, the radius of the vent tube is provided in accordance with known equations. For example, for a vent tube of circular cross-section that is flush-mounted on the apertured wall, the length (Lv) and radius (R) of the vent tube are related as ~ollows:
Lv = 1.463 x 107R2 - 1.463R
~B VB
where Lv ~ len~th in inches fB = tuning frequency in Hz VB = volume o~ the enclosure in cubic inches R = radius in inches Both Loudspeaker Design Cookbook and Speaker Builder describe in detail how to use the above equation to obtain a vent tube.
The location of the vent tube in the loudspeaker of the invention will also be guided by known techniques. Preferably, the vent tube will be mounted on the front or rear wall o~ the enclosure.
In a preferred embodiment of the invention~ the enclosure of the speaker system was ll-l/4 inches high, 6-3/4 inches wide and 7 inches deep in which were mounted a 5-l/4 inch polypropylene cone woofer and a 3/4 inch polycarbonate dome tweeter. A l-l/2 inch diameter straight vent tube was flush mounted in the rear wall at an angle of about 40 to the rear wall to provide an oval aperture of 1-1/2 x 2-3/8 inches. In lab tests conducted by an independent acoustical laboratory retained by Stereo Review Magazine, this mini-speaker system had an octave-to-octave energy balance from 100 to 10,000 Hz that was close to the balance of the lab's full size reference speakers. The enclosure had no other air passage except the oval aperture in the rear wall.
_g_
Claims (29)
1. A vented loudspeaker, which comprises an enclosure having top, bottom, front, rear and opposed side walls, one of said walls having an aperture therein and one of said walls having an opening therein, a speaker within said enclosure and mounted on said wall having said opening for outward projection of sound through said opening, and an elongated, straight vent tube within said enclosure and mounted on said apertured wall for outward projection of sound through said aperture, said vent tube having a longitudinally extending axis, said vent tube being arranged with said axis at an oblique angle with respect to said apertured wall and extending to, but spaced from, a said wall opposite said apertured wall, said vent tube having a length greater than a distance between said apertured wall and said opposite wall.
2. The loudspeaker according to claim 1, wherein said apertured wall is said front wall, said vent tube extending from said front wall to said rear wall.
3. The loudspeaker according to claim 1, wherein said apertured wall is said rear wall, said vent tube extending from said rear wall to said front wall.
4. The loudspeaker according to claim 1, wherein said apertured wall is a side wall.
5. The loudspeaker according to claim 1, wherein said vent tube is normally disposed with said axis lying in a horizontal or a vertical plane.
6. The loudspeaker according to claim 1, wherein said vent tube is normally disposed with said axis oblique to both a horizontal and a vertical plane.
7. The loudspeaker according to claim 1, wherein said apertured wall has an inner and outer surface, said vent tube being mounted flush with said inner surface of said apertured wall.
8. The loudspeaker according to claim 1, wherein said angle is from about 20° to about 60°.
9. The loudspeaker according to claim 2, wherein said angle is from about 35° to about 45°.
10. The loudspeaker according to claim 1, wherein said angle is substantially about 40°.
11. The loudspeaker according to claim 4, wherein said angle is substantially about 40°.
12. The loudspeaker according to claim 5, wherein said angle is substantially about 40°.
13. The loudspeaker according to claim 6, wherein said angle is substantially about 40°.
14. The loudspeaker according to claim 7, wherein said angle is substantially about 40°.
15. The loudspeaker according to claim 10, wherein said vent tube has a circular cross-section.
16. The loudspeaker according to claim 11, wherein said vent tube has a circular cross-section.
17. The loudspeaker according to claim 12, wherein said vent tube has a circular cross-section.
18. The loudspeaker according to claim 13, wherein said vent tube has a circular cross-section.
19. The loudspeaker according to claim 14, wherein said vent tube has a circular cross-section.
20. The loudspeaker according to claim 2, wherein said angle is substantially about 40°.
21. The loudspeaker according to claim 20, wherein said vent tube has a circular cross-section.
22. The loudspeaker according to claim 3, wherein said angle is substantially about 40°.
23. The loudspeaker according to claim 22, wherein said vent tube has a circular cross-section.
24. The loudspeaker according to claim 1, wherein said apertured wall has an inner and an outer surface, the inner surface of said apertured wall is counterbored to provide a recess surrounding said aperture, and said vent tube is mounted in said recess.
25. The loudspeaker according to claim 24, wherein said angle is substantially about 40°.
26. The loudspeaker according to claim 25, wherein said vent tube has a circular cross-section.
27. The loudspeaker according to claim 1, wherein said vent tube extends through said aperture and has a projecting lip extending circumferentially around said vent tube.
28. The loudspeaker according to claim 22, wherein said angle is substantially about 40°.
29. The loudspeaker according to claim 28, wherein said vent tube has a circular cross-section.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/135,840 US4785908A (en) | 1987-12-21 | 1987-12-21 | Vented loudspeaker |
| US135,840 | 1987-12-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1301075C true CA1301075C (en) | 1992-05-19 |
Family
ID=22469952
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000585208A Expired - Lifetime CA1301075C (en) | 1987-12-21 | 1988-12-07 | Vented loudspeaker |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US4785908A (en) |
| CA (1) | CA1301075C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4928788A (en) * | 1989-06-12 | 1990-05-29 | Erickson Jon B | Ported automotive speaker enclosure apparatus and method |
| CA2048954C (en) * | 1991-08-12 | 2002-07-16 | Leopold A. Lewis | Speaker box |
| CA2718103A1 (en) * | 2008-03-17 | 2009-09-24 | Plastic Technologies Inc. | Method and apparatus for improved detection of holes in plastic containers |
| JPWO2021199922A1 (en) * | 2020-03-31 | 2021-10-07 |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1170584A (en) * | 1966-05-04 | 1969-11-12 | Murex Ltd | Means for Reinforcing Thin Walled Tubes |
| SE447780B (en) * | 1981-11-26 | 1986-12-08 | Stig Carlsson | SPEAKER WITH A SOUND ABSORBENT |
| US4482026A (en) * | 1982-12-02 | 1984-11-13 | Stehlin Jr George D | Loudspeaker enclosure |
| US4621708A (en) * | 1984-08-20 | 1986-11-11 | Bose Corporation | Tweeter bidirectional radiating |
-
1987
- 1987-12-21 US US07/135,840 patent/US4785908A/en not_active Expired - Lifetime
-
1988
- 1988-12-07 CA CA000585208A patent/CA1301075C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US4785908A (en) | 1988-11-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed | ||
| MKLA | Lapsed |
Effective date: 20050519 |